Spark-plug.



To all whom it may concern:

State of Illinois, have invented certain new and useful Improvements in Spark-Plugs;

UNITED STATES PATENT OFFICE.

JOSEPH E. MANLOVE, or PLYMOUTH, ILLINOIS.

SPARK-PLUG.

Be it known that I, JOSEPH a citizen of the United States, residing at Plymouth, in the county of Hancock and and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art'to which it appertains to make and use the same.

This invention relates to improvements in spark plugs, and has for its primary object to provide a device of this character em bodying a hollow body having connection with the fuel inlet pipe or'manifold of an' internal combustion engine, whereby the ex plosive mixture is drawn throughthe hollow. body and into' the explosion chamber of the cylinder during the suction stroke of the piston to prevent the accumulation of dead gas within the plug and also to insure against the accumulation of carbon and other deposits upon the electrodes of the spark plug.

. Another object is the provision of a novel type of electrode carrying a substantially cup shaped member.

' With these and other objects in view, the invention consists in the novel construction, combination and arrangement of parts as will'be hereinafter specifically described, claimed and illustrated in the accompanying drawing, in which:

Figure 1 represents a fragmentary sectional 'ew through the'head of thecylinder of an explosive engine, showingthe im proved spark plug inside elevation,

Fig. 2 represents a longitudinal sectional viewthrough the improvedjspark plug, and

Fig. 3 represents a fragmentary sectional view through the insulator and center electrode.

Referring to the drawingin detail, wherein similar referencenumerals designate horresponding parts \';.throughout the several indicates the body of which is of hollow formation and is formed integral with a reduced and externally screwthreaded extension 6 adapted to be secured in the usual s ark plug receiving opening 7 formed in the wall or head of the cylinder 8 of an ex-. plosive engine. The bod 5 is formed centrally with an external 5 oulder 9 forming a stop for a circumferential enlargement 10 Specification of Letters Patent.

E. MANLOVE,

Patented Apr. 17,1917.

Application filed July 21, 1916. Serial No. 110,558.

formed upon the insulator 11, which latter 1s positioned through the body and extension 6 and is secured in position by a ring nut 12. The center electrode 13 is rigidly secured in the insulator 10 and the end thereof which terminates adjacent the open end of the hollow extension 6 is connected with a substantially cup shaped member 14, which latter is constructed of the same material as the electrode Band is disposed'in spaced relation to the other or outer electrode 15, which is carried by the end of the extension 6.

The bore of the body 5 is enlarged intermediate its ends, as indicated at 16, and the wall of the enlarged portion is formed with a plurality of radial inlet ports 17. As clearly shown in Fig. 2 the insulator 10 is disposed in spaced relation to the portion of the wall of the bore of the body intermediate the shoulder 9 and the hollow exv tension 6, so as to permit the explosive mixformed with a transverse opening 20, communicating with the inlet port 17. The opening 20 through the plate 19 is reduced in diameter intermediate its ends to present a seat 21 for an outwardly closing check valve 22, which is normally retained in closed position by-a spring 23 and is designed to prevent the fire :from the explosion occurring in the explosion chamber of the enginefrom entering the" fuel pipe or manifold 20, which latter is attached to the block or plate 19. y

In use, the spark plug is secured in the opening 7 in the wall of the cylinder 8 in the usual manner and during the operation of the engine the electric spark jumps between theelectrode 15 and the cup Shaped member 14. The explosive mixture is conducted from the fuel pipe '24 through the port 17 and hollow body 5 and extension 6 to the explosion chamber and the intermittent flow of the mixture over the electrodes 13 and 14; and the coupling member 14 prevent premature fouling of the electrodes. In starting the explosive engine the heavy vapor or mixture passing through the hollow body in the spark plug contains small particles of liquid fuel, whiclris deposited in the cup shaped member 14 where it will be readily ignited by the spark which jumps between the cup shaped member 14 and the electrode 15.

WVhat I claim is:

A spark plug comprising a hollow rectangular body, a hollow externally screwthreaded extension formed on said body for threaded engagement with the head of an engine, a shoulder formed on the interior of the body and centrally thereof, an insulator having a circumferential enlargement extending through the body and into the extension and having the enlargement disposed against the shoulder, said body having oppositely disposed inlet ports commul; eating with the interior thereof at a point below the shoulder, a plate closing one of said inlet ports and having a transverse opening provided with its walls beveled to form a valve seat, plugs closing the other inlet ports, a spring pressed valve normally closing the transverse opening of the plate, a fuel supply pipe connected to the transverse opening, and electrodes carried by the insulator and extension.

In testimony whereof I aflix my signature in presence of two witnesses.

, JOSEPH E. MANLOVE.

\Vitnesses:

W. G. S'roNER,

ALBERT J. JOHNSON. 

